![SOLAR SYSTEM ,[object Object],[object Object],[object Object],[object Object]](https://image.slidesharecdn.com/ngcasolarsystem-100710031438-phpapp02/85/Ngca-Solar-System-1-320.jpg)
![SUN ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Ngca Solar System
- 13. Sample Quiz Questions Question : Which of the planets are rocky? Answer : The inner planets: Mercury, Venus, Earth and Mars
- 16. Menu Sun Venus Mercury Earth Mars Jupiter Saturn Uranus Neptune Pluto
Hinweis der Redaktion
- I. Uranus (This data is from: http://www.geocities.com/ResearchTriangle/2389/ch_19_26_stdy_gd.html) A. Discovery and Orbit Uranus was discovered in 1781 by Herschel. This caused a sensation, because everyone had assumed they knew all the planets that there were. Its orbit is very slightly elliptical, its year is 84 Earth years long (because -- remember P2=a3 -- it's at an average distance "a" of 19.18 A.U.). Its weirdest feature is that it's turned on its side: its axial tilt is 97deg to the plane of its orbit around the Sun (the ecliptic). Like the other planets, its own equator dominates the dynamics of its ring-and-moons system (not the plane of its orbit around the Sun), so the moons' orbits are really easy to measure right now, as the planet's south pole is pointing toward the inner solar system.